Evaluation of IR Spectra of Mixtures of Natural Ca-Plagioclases and Olivines for Remote Determination of Composition

IF 0.8 4区物理与天体物理 Q4 ASTRONOMY & ASTROPHYSICS

Solar System Research Pub Date : 2026-03-03 DOI:10.1134/S0038094625601070

S. A. Voropaev, V. S. Fedulov, N. V. Dushenko, A. V. Minaev

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Abstract

The features of the IR spectra (mid-IR range) for mixtures of the main minerals of lunar rocks—olivines and Ca-plagioclases (anorthites)—were studied, which complicate the possibility of remote determination of the composition. A comparison was made between numerical models constructed using the CUSTEP software module (Biovia Materials Studio software) and measurements of natural samples using IR spectra. For these purposes, a Fourier spectrometer FT-801 and the double-pass method (Simex, Novosibirsk) were used. Numerical calculations revealed characteristic absorption lines of pure minerals (end members of solid melts), which made it possible, in comparison with the spectra of natural samples, to determine the influence of chemical composition and impurities. IR transmission spectra of experimental mixtures of anorthite and olivine with different proportions made it possible to identify the most characteristic signs of the presence of olivines in Ca-plagioclase powder. Estimates have been made of the corresponding changes in the diffuse reflectance spectra, which are important for the interpretation of measurements by instruments being prepared for operation on planned lunar orbital stations.

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天然钙斜长石与橄榄石混合物成分远程测定的红外光谱评价

研究了月球岩石主要矿物橄榄石和钙斜长石（钙长石）混合物的红外光谱特征（中红外范围），使其成分的远程测定变得复杂。利用CUSTEP软件模块（Biovia Materials Studio软件）构建的数值模型与利用红外光谱测量的自然样品进行了比较。为此，使用了傅里叶光谱仪FT-801和双通道法（Simex, Novosibirsk）。数值计算揭示了纯矿物（固体熔体的末端成员）的特征吸收线，从而可以与自然样品的光谱进行比较，确定化学成分和杂质的影响。用不同比例的钙长石与橄榄石混合的红外透射光谱可以识别出钙长石粉中橄榄石存在的最具特征的标志。已经对漫反射光谱的相应变化进行了估计，这对于解释正在为计划中的月球轨道站运行而准备的仪器的测量值是重要的。

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来源期刊

Solar System Research 地学天文-天文与天体物理

CiteScore

1.60

自引率

33.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Solar System Research publishes articles concerning the bodies of the Solar System, i.e., planets and their satellites, asteroids, comets, meteoric substances, and cosmic dust. The articles consider physics, dynamics and composition of these bodies, and techniques of their exploration. The journal addresses the problems of comparative planetology, physics of the planetary atmospheres and interiors, cosmochemistry, as well as planetary plasma environment and heliosphere, specifically those related to solar-planetary interactions. Attention is paid to studies of exoplanets and complex problems of the origin and evolution of planetary systems including the solar system, based on the results of astronomical observations, laboratory studies of meteorites, relevant theoretical approaches and mathematical modeling. Alongside with the original results of experimental and theoretical studies, the journal publishes scientific reviews in the field of planetary exploration, and notes on observational results.